Earlier this week, Tesla held an event to mark the launch of its long-awaited Model X electric sports-utility vehicles. The event also buoyed the Model S, Musk said.

“We were worried that maybe there would be some cannibalization of Model S orders,” Musk said, speaking during an event in New York held by SolarCity Corp SCTY.O, a solar energy company of which Musk also serves as chairman.

During the event at the Nasdaq, at which SolarCity announced a panel it says is the industry’s most efficient, Musk also said construction of Tesla’s giant $5 billion battery plant in Nevada, known as the “gigafactory,” was “progressing very well” and that he hoped it would begin production in the spring.